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American Physical Society, Physical Review Letters, 2(109), 2012

DOI: 10.1103/physrevlett.109.022501

Springer Verlag, Few-Body Systems, 1-4(54), p. 459-463

DOI: 10.1007/s00601-012-0413-3

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The N = 16 spherical shell closure in 24O

Journal article published in 2012 by K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, S. Deguchi, Y. Kawada, Y. Kondo, N. Kobayashi, Y. Nakayama, K. N. Tanaka, N. B. Tanaka, N. Aoi, M. Ishihara, T. Motobayashi and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p')23O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin-parity of the first excited state, observed at Ex = 4.65 +/- 0.14 MeV, was determined to be Jpi = 2+ from the angular distribution of the cross section. Higher lying states were also observed. The quadrupole transition parameter beta2 of the 2+ state was deduced, for the first time, to be 0.15 +/- 0.04. The relatively high excitation energy and small beta2 value are indicative of the N = 16 shell closure in 24O. ; Comment: to be submitted to Physical Review Letters